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Related Party Transactions - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 1 Months Ended |  |  |
--- | --- | --- | --- | ---
Aug. 18, 2010 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2009
Investment Management And Other Fees And Related Party Transactions [Line Items] |  |  |  |
Percentage of outstanding shares of Series B |  | 100.00% |  |
Accounts payable, related parties |  | $ 0.1 | $ 0.2 | $ 0.4
Accounts payable, related parties | $ 0.8 |  |  |

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